yO ALLEN 



trie artery (PL IV, fig. 29; P. Gas. A.), which supplies the 

 ventral posterior or cardiac portion of the stomach. The main 

 intestinal trunk crosses the caeca and after passing under the 

 first arm of the ileum sends off intestinal artery ^^^ (PI* IV, fig. 29 ; 

 Int A. 2), which supplies the posterior part of the intestine ; while 

 the main intestinal trunk continues caudad, supplying both arms 

 of the ileum. Except from the different points of origin, the 

 left hematic artery (PI. IV, figs. 29 and 30 ; L.Hep.A.) coming 

 from the right gastric artery, and the right hepatic artery (PI. 

 IV, figs. 29 and 30; R. Hep. A.) from the left gastric arter}^, 

 the peripheral distribution of the 2 hepatic arteries is practically 

 the same as in Ophiodon. Perhaps it should be mentioned that 

 there is but one left hepatic artery in Scorpanichthys. 



Mesenteric Artery in Hexagrammos (PI. IV, fig. 27 ; Mes.- 

 A.). — As has already been stated, the lejt gastric arteiy (PI. 

 IV, fig. 27 ; L. Gas. A.), which is much shorter than in the other 

 3 genera, is given off almost directly opposite the coeliac arter}^ 

 This would make it appear as though the coeliaco-mesenteric 

 trunk separated into 3 branches, namely, the coeliac, mesenteric 

 and left gastric arteries. The mesenteric artery runs along the 

 stomach for a short distance and divides into the characteristic 

 right gastric and intestinal arteries. As in Ophiodon the right 

 gastric artery (PI. IV, fig. 27 : R.Gas.A.) follows along the 

 right and upper side of the stomach, but it has, however, ex- 

 changed positions with the right gastric vein. In this respect 

 it also differs from Scorpcenichthys and Sebastodcs. Close to 

 its source it gives off the left hepatic artery (PI. IV, figs. 27 

 and 28; L.Hep.A.), which comes into very close contact with 

 the coeliac artery and breaks up into 3 branches, which pene- 

 trate the liver with terminal branches «, b, and c of the left 

 portal vein. The branch following terminal branch a anasto- 

 moses with the right hepatic artery in a similar manner to the 

 anastomosing of this branch of the left portal with the right 

 portal vein. As in Scorpcenichthys there is but one left hepatic 

 artery. The Intestinal artery ^^^{p\. IV, fig. 27 ; Int. A.,,,) soon 

 after leaving the mesenteric artery sends off the right hepatic 

 artery (PI. IV, fig. 27 ; R.Hep.A.), which at first runs along the 

 surface of the gall-bladder as the gall-bladder artery, and pene- 



